OK, let's work through this together. We're starting with 172 and we're going to multiply it by 67, which means we add 172 to itself 67 times.
Step 1: 0 + 172 = 172
Step 2: 172 + 172 = 344
Step 3: 344 + 172 = 516
Step 4: 516 + 172 = 688
Step 5: 688 + 172 = 860
Step 6: 860 + 172 = 1032
Step 7: 1032 + 172 = 1204
Step 8: 1204 + 172 = 1376
Step 9: 1376 + 172 = 1548
Step 10: 1548 + 172 = 1720
Step 11: 1720 + 172 = 1892
Step 12: 1892 + 172 = 2064
Step 13: 2064 + 172 = 2236
Step 14: 2236 + 172 = 2408
Step 15: 2408 + 172 = 2580
Step 16: 2580 + 172 = 2752
Step 17: 2752 + 172 = 2924
Step 18: 2924 + 172 = 3096
Step 19: 3096 + 172 = 3268
Step 20: 3268 + 172 = 3440
Step 21: 3440 + 172 = 3612
Step 22: 3612 + 172 = 3784
Step 23: 3784 + 172 = 3956
Step 24: 3956 + 172 = 4128
Step 25: 4128 + 172 = 4300
Step 26: 4300 + 172 = 4472
Step 27: 4472 + 172 = 4644
Step 28: 4644 + 172 = 4816
Step 29: 4816 + 172 = 4988
Step 30: 4988 + 172 = 5160
Step 31: 5160 + 172 = 5332
Step 32: 5332 + 172 = 5504
Step 33: 5504 + 172 = 5676
Step 34: 5676 + 172 = 5848
Step 35: 5848 + 172 = 6020
Step 36: 6020 + 172 = 6192
Step 37: 6192 + 172 = 6364
Step 38: 6364 + 172 = 6536
Step 39: 6536 + 172 = 6708
Step 40: 6708 + 172 = 6880
Step 41: 6880 + 172 = 7052
Step 42: 7052 + 172 = 7224
Step 43: 7224 + 172 = 7396
Step 44: 7396 + 172 = 7568
Step 45: 7568 + 172 = 7740
Step 46: 7740 + 172 = 7912
Step 47: 7912 + 172 = 8084
Step 48: 8084 + 172 = 8256
Step 49: 8256 + 172 = 8428
Step 50: 8428 + 172 = 8600
Step 51: 8600 + 172 = 8772
Step 52: 8772 + 172 = 8944
Step 53: 8944 + 172 = 9116
Step 54: 9116 + 172 = 9288
Step 55: 9288 + 172 = 9460
Step 56: 9460 + 172 = 9632
Step 57: 9632 + 172 = 9804
Step 58: 9804 + 172 = 9976
Step 59: 9976 + 172 = 10148
Step 60: 10148 + 172 = 10320
Step 61: 10320 + 172 = 10492
Step 62: 10492 + 172 = 10664
Step 63: 10664 + 172 = 10836
Step 64: 10836 + 172 = 11008
Step 65: 11008 + 172 = 11180
Step 66: 11180 + 172 = 11352
Step 67: 11352 + 172 = 11524

So, 172*67 = 11524